Carfilzomib-induced acute cardiotoxicity is mediated through angiotensin and caused by cardiomyocyte energy depletion

Abstract

Carfi lzomib (CFZ) treatment increases the survival of patients with relapsed/refractory MM, but it is associated with a higher incidence of cardiovascular adverse events not commonly observed after bortezomib (BTZ). Both CFZ and BTZ inhibit the rate-limiting proteasome beta 5 subunit activity at lower concentrations. However, only CFZ co-inhibits the activity of proteasome beta 5 and beta 2 subunits at higher doses, in contrast to the beta 5 and beta 1 co-inhibition provided by high dose BTZ. We hypothesized that the unique beta 5 and beta 2 subunit inhibition pattern explains the CFZ-related acute cardiotoxicity.